Flat Glass Lite Weight
The weight of a glass lite for a safe lift: soda-lime float glass runs about 13.0 lb per square foot per inch of thickness (specific gravity 2.50), so weight = 13.0 x thickness(in) x area(ft^2). A 60 x 40 in lite of 1/4" glass is 16.7 ft^2 and 54 lb -- past the ~50 lb one-person limit, so a two-person or vacuum-cup lift. Tempering does not change the weight; an insulating unit (IGU) is the sum of its lites. Sizes the lift and checks it against a suction lifter's rating. A handling estimate; the glass type, the lifter's rating, and safe-lifting practice govern.
Formula and source
weight_lb = 156.1 lb/ft^3 x area_ft2 x thickness_in/12 x panes; area_ft2 = width_in x height_in / 144; weight_per_ft2 = 156.1 x thickness_in/12 (~13.0 lb/ft^2 per inch).
Flat glass lite weight (NGA Glazing Manual glass-weight table; ASTM C1036 flat glass), by name; the glass type and the lifter's rating govern.
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